docs: def http_post(blink, url, is_retry=False):
      """
      Perform an http post request.
  
      :param url: URL to perfom post request.
      :param is_retry: Is this part of a re-auth attempt?
      """
      if blink.auth_header is None:
          raise BlinkException(ERROR.AUTH_TOKEN)
      _LOGGER.debug("Making POST request to %s", url)
      return http_req(blink, url=url, headers=blink.auth_header,
                      reqtype='post', is_retry=is_retry)